Pulp-drier



F. V. BURMAN.

PULP DRIER.

APPLICATION FILED APR.21. 1920.

l Patented Mar. 1, 1921.

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INVENToR. l". W3 zLzjnan.

6., K ATTQRNEYJ UNITED STATES I FRANK v. Btrmvmiv,l or MARINE CITY, MICHIGAN.-

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Application filed April 21,

To all whom t 'may concern.'

Be it known that I, FRANK V. BURMAN, a citizen of the United States, residing at Marine Cit. in the county of St. Clair and State of 1 ichigan, have invented new and useful Improvements in Pulp-Driers, of which lthe following is a specification.

This invention relates to drying apparatus in which the material `is dried by being' passed through a' revolving cylinder or drum. An a )aratus of this typeis disclosed in my atent No. 1,336,422, and the present invention has for its object to provide the apparatus with certain improvements to be described hereinafter inl detail and claimed.

In order that the invention may be better understood, reference is had to the accom- Y panying drawing in which a Vlongitudinal section of the apparatus is shown. p

In the drawing, 5 and 6 denote, respectively, two concentrically arranged and horizontally positioned cylinders adapted to re ceive the wet pulp or other material to be dried. The drum 5 is inside the drum 6 andis open at one end to receive the material from a discharge chute 7 extending` into said end and leading from a suitable conveying apparatus. The other end of they .drum also has an opening 8 t0 discharge into the corresponding end of the outer drum as shown by the arrow in the drawing, and itl passes through this drumto an outlet 9 at Vthe opposite end thereof. The last-mem` .tioned end of the drumy 6 also has a vapor outlet 11 into a flue 12.

The two drums are fastened together in any approved manner to rotate as one, and the outer drum 6 is shorter than the inner drum 5 so as to leave the ends of the latter projecting from the former. These projecting ends of the drum 5 are suitably supported on rollers 13 as usual so as to be free to ro-v tate, and means are provided for driving the drum. These driving means need not be described as they form no part of the present invention. i A

The front end of the drum 6 is next to the source of heat, the same being a furnace 26 which supplies hot air to the drums.

,In the drum 5 are flights 27 in screw form for urging the material to the rear end thereof ,for discharge into the drum 6, and

I Specication of Letters Patent.-

ratented Man-1, 1921..

1920. Serial VNo. 375,598.

in the drum 6 are similar flights 27a, but re versely arranged to carry the material back to the outlet 9. The drum 5 also contains the apertured and toothed partition plates 28 disclosed and claimed in the application hereinbefore referred to. Y

In order to facilitate the passage of the material into the drum 6, its receiving end onto which-the material drops as it is discharged from the drum 5, is made conical as shown at 32.` The'incline thus formed allows the material. to slide freely down into the drum and prevents it from gathering in the corners and burning. The forward projecting end of the drum 5 :ls-of course closed and 1t is entered by an auxiliaryv deliverychute 38 discharging on the inclined surface 32 of the drum 6. The purpose allow partially dried material to be dumped into the drum 6, so that in traveling forwardly to the outlet 9 it is thoroughly dried. The chute 33 has an observation hole 34 so of this auxiliaryfeed chute is to that it is made possible to observe the condil tion of the material in the apparatus, and properly regulate the heat.

I claim:

1. In a drying apparatus, a pair of r0- tatable drums located one inside the other, l the inner drum having a material inlet'at one endand an outlet at theopposite vend into the .corresponding receiving end (of the outer drum, and the outer drum having an outlet at its end opposite its receiving end, said receiving end of the outer drum being conical, and an auxiliary material feeding means discharging on the receiving end -of the outer drum.

2. In a drying apparatus, a pair of rotatable drums located one inside the other, the inner drum having a material inlet at one end and an outlet at the opposite end into the corresponding receiving end of the outer drum, and the outer drum having an outlet at its end opposite its receiving end, said receiving end of the outer drum beingl conical, an auxiliary material feeding means discharging on the receiving end of the outer drum, said means having on the outside of the drums an observation hole into the interior of the drums.

In testimony whereof I aiiix my signature.' 

